Marie-Chantal travels by train to her cousin's place to spend a winter holiday, when a stranger entrusts her with false jewels that contain a virus powerful enough to destroy all humankind.
Marie Laforêt
Marie-Chantal
Francisco Rabal
Paco Castillo
Serge Reggiani
Ivanov
Charles Denner
Johnson
Stéphane Audran
Olga
Akim Tamiroff
Prof. Lambaré / Dr. Kha
Roger Hanin
Bruno Kerrien
Antonio Passalia
Sparafucile
